COVID-19 Vaccines: Placebo Crossover May Depend Upon Number Of Doses, Allocation Strategy

Editorial use only - ARCADIA, CA - MAR 20: Horses break from the gate in an allowance race at Santa Anita Park on Mar 20, 2010 in Arcadia, CA
Once the first COVID-19 vaccines out of the gate become available, clinical trials of earlier-stage candidates might look different. • Source: Shutterstock

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